According to the Biology Bulletin, No. 4, 1963, No. 4, page 38, the method described in Comrade Ren Linhan’s article “Selling Tests on the Respiration of Plant Respiration” was tried out with good results, but the device was cumbersome and inconvenient to handle. Demonstration experiments that can only do 1-2 sessions at a time cannot be applied continuously. If there are many classes, they require multiple sets of device containers. This is inconvenient. Plant respiration analyzer is a good method for rapid detection of crops in modern agricultural production.

A wide-mouth bottle instead of a glass cover does this experiment and teaches the same results. The device is relatively simple, the method is: 3-4 days before class, the students of the organizational botany interest group take two equal volumes of wide mouth bottle (as a spinach) into the bottom of the bottle into 2-3 PCT deep water, Put a vigorously growing cabbage in each bottle or sow winter wheat in the bottle, stopper the stopper, and then apply Vaseline to avoid leakage. Place one jar in the dark for 2-3 days and the other in a bright place as a control.

In the classroom demonstration, first open the dark-processed wide-mouth bottle stopper and put the burning candle in it. Immediately extinguish (it also inspires the student to conclude that the bottle lacks Oa~Oa absorbed by the cabbage). Insert a funnel and a rubber stopper of a curved glass tube into the mouth of the bottle. Insert the other end of the curved glass tube into a test tube containing clarified lime water. Then pour clear water into the funnel and you can see it. The glass tubes inserted in the lime water continuously emit bubbles, and the clarified lime water soon becomes cloudy (inspire the students to come to the conclusion that the Mood plants breathe and suck in Oa and release C). Finally, use the same operation again. The method demonstrates that the wide-mouth bottle placed in a bright place is indestructible, and the clarified lime water does not become cloudy. At this time, students should be inspired to consider why the results of the demonstration of the jar in the light and in the dark are not the same. In order to understand the difference between respiration and photosynthesis. According to my experience, the experimental material is preferably cabbage, and other materials are often prone to failure. The plant respiration analyzer plays a very important role in the detection of plant respiration, which is also a result of long-term experimental application.

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